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Preparation method of lithium hexafluorophosphate

A technology of lithium hexafluorophosphate and lithium fluoride, applied in lithium hexafluorophosphate, chemical instruments and methods, lithium compounds, etc., can solve problems affecting the formation rate of lithium hexafluorophosphate, poor solubility of lithium fluoride, etc., and achieve the effects of saving energy, improving purity, and shortening time

Pending Publication Date: 2022-03-15
SUZHOU HUAYI NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that although the preparation of lithium hexafluorophosphate has been realized in the related technologies, the solubility of lithium fluoride in triethylamine is relatively poor, and the phosphorus pentafluoride triethylamine complex in the mixed solution is only It can react on the surface of anhydrous lithium fluoride powder and affect the formation rate of lithium hexafluorophosphate

Method used

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  • Preparation method of lithium hexafluorophosphate
  • Preparation method of lithium hexafluorophosphate
  • Preparation method of lithium hexafluorophosphate

Examples

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preparation example 1

[0047] In this application, straw charcoal particles are prepared according to the following method:

[0048] (1) drying the straw at 75°C until the water content is 0.8%, and then pulverizing the straw to an average particle size of 650 μm to obtain straw powder;

[0049] (2) Mix 100kg of straw powder and 200kg of washing liquid evenly to obtain a straw powder dispersion, heat the straw powder dispersion to 300°C in an airtight container, then keep it warm for 70min, then stop heating to obtain a carbon particle dispersion; this step In, washing liquid deionized water;

[0050] (3) performing suction filtration on the carbon particle dispersion, and then cleaning and drying the suction filtration product to obtain straw carbon particles.

preparation example 2

[0052] The difference between this preparation example and preparation example 1 is that the washing solution is a sodium lauryl sulfate solution with a water content of 82%.

Embodiment 1-5

[0056] Embodiment 1 is taken as an example below for description.

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Abstract

The invention relates to the technical field of battery production, and particularly discloses a preparation method of lithium hexafluorophosphate. The preparation method of the lithium hexafluorophosphate comprises the following steps: (1) uniformly mixing phosphorus pentachloride, triethylamine and a fluorinating agent to obtain a raw material solution; (2) mixing and uniformly stirring lithium hydroxide, ammonium fluoride, a pore-forming agent, a combustion improver and the binder dispersion liquid, and drying to obtain a lithium fluoride mixture; (3) calcining the lithium fluoride mixture to constant weight at 700-750 DEG C to obtain porous lithium fluoride; and (4) uniformly mixing the porous lithium fluoride with the raw material solution under the protection of nitrogen, keeping the temperature at 5-15 DEG C for 60-80 minutes, filtering and concentrating under reduced pressure to obtain a crude product lithium hexafluorophosphate, and purifying the crude product lithium hexafluorophosphate to obtain the lithium hexafluorophosphate. According to the porous lithium fluoride, the generation rate of lithium hexafluorophosphate can be increased, and the time required for producing the lithium hexafluorophosphate can be shortened.

Description

technical field [0001] The application relates to the technical field of battery production, more specifically, it relates to a preparation method of lithium hexafluorophosphate. Background technique [0002] Lithium-ion battery is a rechargeable battery with no pollution, long cycle life and high cycle efficiency. It is widely used in small mobile power supplies, electric vehicles and electric bicycles. Electrolyte lithium salt is the main component of lithium-ion battery electrolyte, and the more commonly used types are lithium difluorooxalate borate, lithium difluorophosphate, lithium hexafluorophosphate, etc. Among them, the dominant electrolyte lithium salt is lithium hexafluorophosphate. [0003] There is a preparation method of lithium hexafluorophosphate in the related art, comprising the following steps: (1) under the protection of nitrogen, 20.8kg of phosphorus pentachloride solid, 100L of triethylamine, and 10kg of fluorinating agent are mixed uniformly, and kept...

Claims

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Application Information

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IPC IPC(8): C01D15/00
CPCC01D15/005C01P2006/80
Inventor 王振一王小龙管晓东周洋汪许诚
Owner SUZHOU HUAYI NEW ENERGY TECH CO LTD
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